Greetings, Going through J I found that:
x=:1+i.5 x 1 2 3 4 5 44 (2}) x 1 2 44 4 5 x 1 2 3 4 5 It seems that J doesn't actually make an indexed assignment. It seems more like it creates a copy of the array with the specified modifications. This is actually quite shocking. Index assignment to a very large array in most languages is a very fast and simple operation. It is also very memory efficient. Creating a modified copy of a very large array has a much, much greater time and space cost. Further, multiplying this (unnecessary) cost over a great number of operations can drastically (and unnecessarily) affect performance negatively. Am I missing something here? Thanks. Blake McBride ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
